Perhaps you should try some spelling variations:
trinh luan » trinh luat, trinh quan, trinh han
hanh trinh » canh tranh, hanh chinh
hien sach » kien sach, thien hach, chieu sach
dien sach » dien anh
luan vung » luan hung, luan ung, luan chung
vung dang » vung dong, dung dang, vung ang
dang van » hoang van, hang va
ban cau » bang cau, ban can, van cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (dien sach)) - hanh trinh luan vung dang van ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien sach)) - hanh trinh luan vung dang van ban cau*.